Are there any equipment rental booking software that focus on managing registrations and capacity limits?

Yes — there are booking/rental systems that are especially good for registration-style bookings and capacity-limited scheduling. They’re often marketed for classes, events, tours, appointments, or reservations, but can work well for equipment rental when the key issue is controlling how many people/items can be booked at once.

A few categories to look at:

1) Registration / reservation platforms with capacity controls

These are best if you need:

• attendee/customer registration
• per-time-slot or per-session capacity limits
• waitlists
• approvals or prerequisites
• reminders and check-in

Examples:

• Acuity Scheduling — good capacity and appointment management, but more service/appointment-oriented than true equipment inventory.
• Calendly Teams / routing tools — useful for registrations and limits, though not rental-specific.
• FareHarbor — strong for tours/activities with capacity limits; can be adapted to equipment booking scenarios.
• Checkfront — often used for rentals, tours, and bookings; supports capacity and inventory-style controls.
• Booqable — more rental-focused, and good for managing stock availability; less “registration” oriented, but practical for equipment rental.
• Rezdy — strong for bookings and capacity management, especially for tours/activities; can fit rental-like workflows.

2) Rental-focused software with inventory/capacity management

These are better if you need:

• item-level inventory
• quantity tracking
• availability by time/date
• deposits/payments
• bundles/packages

Examples:

• Booqable
• Checkfront
• HireHop
• EZRentOut
• Point of Rental
• TapGoods
• Rentman (especially for AV/event gear and crew scheduling)

3) Event registration software that can be adapted to rentals

If your “rental” is really more like reserving a limited resource or slot:

• Eventbrite (capacity-based registration)
• Cvent
• Ticket Tailor
• Arlo These are more registration/event tools than rental systems, but they handle capacity very well.

Which type to choose?

• If you need real inventory tracking for physical equipment: look at Booqable, Checkfront, EZRentOut, Point of Rental, HireHop, Rentman.
• If you need registration + capacity limits more than inventory: look at Eventbrite, Cvent, Ticket Tailor, FareHarbor, Rezdy.
• If you need both: Checkfront and Booqable are often good places to start.

If you want, I can give you a shortlist of 5 tools based on your exact use case, like:

• number of equipment items
• hourly vs daily bookings
• public registration vs internal staff booking
• payment/deposit needs
• waitlists/capacity rules